Added -Location parameter to Set- AzVMRunCommand (Azure#18885)

* Added -Location parameter to Set- AzVMRunCommand

* Update src/Compute/Compute.Autorest/examples/Set-AzVMRunCommand.md

* Fixed typos

* Fixed typo

Co-authored-by: Beisi Zhou <[email protected]>

Author: pselugar

src/Compute/Compute.Autorest/examples/Set-AzVMRunCommand.md

@@ -1,10 +1,10 @@
 ### Example 1: Simple Example
 ```powershell
-PS C:\> Set-AzVMRunCommand -ResourceGroupName $rgname -VMName $vmname -RunCommandName 'firstruncommand' 
+PS C:\> Set-AzVMRunCommand -ResourceGroupName $rgname -VMName $vmname -Location 'eastus' -RunCommandName 'firstruncommand' 
 
 Location Name             Type
 -------- ----             ----
-eastus   firstruncommand2 Microsoft.Compute/virtualMachines/runCommands
+eastus   firstruncommand Microsoft.Compute/virtualMachines/runCommands
 ```
 
-The Set-AzVMRunCommand cmdlet updates properties for existing run command or adds a new run command to a virtual machine.
+The Set-AzVMRunCommand cmdlet updates properties for existing run command or adds a new run command to a virtual machine.